GB1256280A - Automatic flash exposure control systems - Google Patents
Automatic flash exposure control systemsInfo
- Publication number
- GB1256280A GB1256280A GB06036/69A GB1603669A GB1256280A GB 1256280 A GB1256280 A GB 1256280A GB 06036/69 A GB06036/69 A GB 06036/69A GB 1603669 A GB1603669 A GB 1603669A GB 1256280 A GB1256280 A GB 1256280A
- Authority
- GB
- United Kingdom
- Prior art keywords
- flash
- exposure
- exposure control
- camera lens
- vane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
- G03B15/03—Combinations of cameras with lighting apparatus; Flash units
- G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2215/00—Special procedures for taking photographs; Apparatus therefor
- G03B2215/05—Combinations of cameras with electronic flash units
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Stroboscope Apparatuses (AREA)
- Exposure Control For Cameras (AREA)
Abstract
1,256,280. Flash exposure control. EASTMAN KODAK CO. March 27, 1969 [April 2, 1968], No.16036/69. Heading G2A. A pre-exposure flash sets the diaphragm for the main flash. The low-intensity pre-exposure flash is detected by the photo-resistive cell 1, the signal generated amplified at 2, the effect of the ambient illumination filtered out at 3, and galvanometer 4 deflected accordingly. The attached diaphragm vane 5 has a tapered aperture 8 which moves across the camera lens 9 from right to left, and is then retained in the set position by a pawl and ratchet arrangement 6, 7. The main flash exposure, whose intensity is a known multiple of that of the pre-exposure flash, is made immediately following. In the modification of Fig. 6 (not shown), the movement of the vane 5 at the same time actuates a rack and pinion arrangement which controls a focusing movement of the camera lens.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US71803368A | 1968-04-02 | 1968-04-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1256280A true GB1256280A (en) | 1971-12-08 |
Family
ID=24884535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB06036/69A Expired GB1256280A (en) | 1968-04-02 | 1969-03-27 | Automatic flash exposure control systems |
Country Status (4)
Country | Link |
---|---|
US (1) | US3547017A (en) |
DE (1) | DE1916801A1 (en) |
FR (1) | FR2005370A1 (en) |
GB (1) | GB1256280A (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1455900A (en) * | 1973-02-09 | 1976-11-17 | Konishiroku Photo Ind | Single leans reflex camera |
US4199235A (en) * | 1977-11-26 | 1980-04-22 | Canon Kabushiki Kaisha | Camera with autofocusing device |
DE2902501A1 (en) * | 1978-02-04 | 1979-08-09 | Minolta Camera Kk | INDEPENDENT FOCUS ADJUSTMENT FOR CAMERAS |
US4305647A (en) * | 1978-07-10 | 1981-12-15 | Minolta Camera Kabushiki Kaisha | Camera flash photography systems |
JPS5697334A (en) * | 1979-12-31 | 1981-08-06 | Minolta Camera Co Ltd | Control device of flash device for photography |
US4474441A (en) * | 1980-03-04 | 1984-10-02 | Polaroid Corporation | Method and apparatus for controlling exposure by selective use of blocking visible filter |
US4357083A (en) * | 1980-10-06 | 1982-11-02 | Polaroid Corporation | Method and apparatus using weighted range signal for controlling photographic functions |
US4549801A (en) * | 1983-03-21 | 1985-10-29 | W. Haking Enterprises Limited | Automatic focussing camera with automatic aperture setting |
US4561753A (en) * | 1985-03-13 | 1985-12-31 | Polaroid Corporation | Selective photoresponsive sensing circuit |
US5448331A (en) * | 1991-08-01 | 1995-09-05 | Minolta Camera Kabushiki Kaisha | Camera utilizing additional illumination from a flash light for focus detection and exposure operation |
WO2007012041A2 (en) | 2005-07-20 | 2007-01-25 | Lab Partners Associates, Inc. | Wireless photographic communication system and method |
US7783188B2 (en) | 2007-05-29 | 2010-08-24 | Lab Partners Associates, Inc. | System and method for maintaining hot shoe communications between a camera and a wireless device |
US8718461B2 (en) | 2009-02-12 | 2014-05-06 | Lab Partners Associates, Inc. | Photographic synchronization optimization system and method |
US9690169B2 (en) | 2013-11-04 | 2017-06-27 | Lab Partners Associates, Inc. | Photographic lighting system and method |
-
1968
- 1968-04-02 US US718033A patent/US3547017A/en not_active Expired - Lifetime
-
1969
- 1969-03-27 GB GB06036/69A patent/GB1256280A/en not_active Expired
- 1969-04-01 DE DE19691916801 patent/DE1916801A1/en active Pending
- 1969-04-01 FR FR6909803A patent/FR2005370A1/fr not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
FR2005370A1 (en) | 1969-12-12 |
US3547017A (en) | 1970-12-15 |
DE1916801A1 (en) | 1969-11-27 |
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